scholarly journals Green Synthesis of Polysubstituted Quinolines and Xanthene Derivatives Promoted by Tartaric Acid as a Naturally Green Catalyst under Solvent-free Conditions

2018 ◽  
Vol 13 (1) ◽  
pp. 74-86 ◽  
Author(s):  
Farzaneh Mohamadpour ◽  
Malek Taher Maghsoodlou ◽  
Mojtaba Lashkari ◽  
Reza Heydari ◽  
Nourallah Hazeri
Keyword(s):  
Green Synthesis ◽  
Tartaric Acid ◽  
Solvent Free ◽  
Green Catalyst ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives

scholarly journals ZnCl2 loaded TiO2 nanomaterial: an efficient green catalyst to one-pot solvent-free synthesis of propargylamines

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32735-32743 ◽  
Author(s):  
Digambar B. Bankar ◽  
Ranjit R. Hawaldar ◽  
Sudhir S. Arbuj ◽  
Mansur H. Moulavi ◽  
Santosh T. Shinde ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Solvent Free ◽  
Economic Viability ◽  
One Pot ◽  
Environment Friendly ◽  
Green Catalyst ◽  
Sustainable Environment ◽  
Solvent Free Conditions ◽  
Solvent Free Synthesis

A one-pot green synthesis of propargylamines using nanostructured ZnCl2–TiO2 under solvent-free conditions has been effectively accomplished. The proposed reaction protocol is sustainable, environment-friendly and offers economic viability.

Synthesis of Dihydropyrimidinones (DHPMs) and Hexahydro Xanthene Catalyzed by 1,4-Diazabicyclo [2.2.2] Octane Triflate Under Solvent-Free Condition

2019 ◽  
Vol 16 (5) ◽  
pp. 776-786 ◽  
Author(s):  
Deepa ◽  
Geeta D. Yadav ◽  
Mohd J. Aalam ◽  
Pooja Chaudhary ◽  
Surendra Singh
Keyword(s):  
Ethyl Acetoacetate ◽  
Biginelli Reaction ◽  
Solvent Free ◽  
Efficient Catalyst ◽  
Solvent Free Condition ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives ◽  
Different Temperatures ◽  
Flash Column Chromatography ◽  
Biginelli Condensation

Objective:DABCO salts were evaluated as catalysts for the Biginelli reaction between 4- methoxybenzaldehyde, urea and ethyl acetoacetate under solvent-free conditions. 1,4-Diazabicyclo [2.2.2] octane triflate was found to be a simple, inexpensive, highly efficient catalyst for Biginelli reaction for a variety aromatic aldehyde with urea and ethyl acetoacetate at 80°C afforded corresponding 3,4-dihydropyrimidinones in 50-99% yields after 30-120 minutes. 1,3-Cyclohexadione was used in place of ethyl acetoacetate in the absence of urea this methodology is giving hexahydro xanthene derivatives in good to excellent yields after 3-4 hours.Methods:DABCO salt 4 (5 mol%), 4-methoxybenzaldehyde (0.73 mmol) and urea (0.73 mmol) were stirred for 10 minutes at 80°C, then ethyl acetoacetate (1.5 equiv.) was added and reaction mixture was stirred at 80°C for specified time. The resulting solution was stirred continuously and progress of the reaction was followed by TLC. The crude reaction mixture was purified by flash column chromatography on silica gel (hexane/ethyl acetate (1:2)) to give pure desired product.Results:Reaction conditions of the Biginelli reaction were optimized using 4-methoxybenzaldehyde (0.73 mmol), urea (0.73 mmol), and ethyl acetoacetate (5 equiv.) as model substrates catalyzed by 1,4-Diazabicyclo [2.2.2] octane triflate (5 mol%) in a different solvents, screening of different catalysts and different temperatures. Neat condition was found to be the best for the Biginelli condensation and corresponding 3,4- dihydropyrimidinones was obtained in good to excellent yields. When the reaction was carried out with benzaldehyde derivatives and cyclohexane-1,3-dione in place of ethyl acetoacetate in the absence of urea, solely corresponding hexahydro xanthene derivatives were obtained in 61-91% yields.Conclusion:In conclusion, we have applied salts of 1,4-Diaza-bicyclo [2.2.2] octane as catalysts in the Biginelli condensation and corresponding 3,4-dihydropyrimidinones were obtained in 50- 99% yields under solvent free conditions. This methodology is having advantages like simple work-up; low loading of catalyst and reaction was performed at moderate temperature under solvent-free conditions.

scholarly journals Green synthesis of new lawsone enaminones and their Z/E(CC)-isomerization induced by organic solvent

RSC Advances ◽  
2021 ◽  
Vol 11 (21) ◽  
pp. 12990-12994
Author(s):  
Abolfazl Olyaei ◽  
Amir Mohamadi ◽  
Nilufar Rahmani
Keyword(s):  
Organic Solvent ◽  
Green Synthesis ◽  
Aromatic Amines ◽  
Solvent Free ◽  
Triethyl Orthoformate ◽  
Guanidinium Chloride ◽  
New Class ◽  
Solvent Free Conditions

The synthesis of a new class of lawsone enaminone derivatives by using lawsone, triethyl orthoformate and aromatic amines in the presence of guanidinium chloride under solvent-free conditions has been developed.

A novel reusable and efficient nano-ZnS catalyst for green synthesis of xanthenes and its derivatives under solvent free conditions

2014 ◽  
Vol 1 (4) ◽  
pp. 306 ◽  
Author(s):  
K. V. V. Satyanarayana ◽  
M. Ravi Chandra ◽  
P. Atchuta Ramaiah ◽  
Y. L. N. Murty ◽  
E. N. Pandit ◽  
...  
Keyword(s):  
Green Synthesis ◽  
Solvent Free ◽  
Solvent Free Conditions

scholarly journals ZnO Nanoparticles: A Highly Effective and Readily Recyclable Catalyst for the One-Pot Synthesis of 1,8-dioxo-decahydroacridine and 1,8-dioxooctahydro-xanthene Derivatives

2017 ◽  
Vol 57 (1) ◽  
Author(s):  
Javad Safaei-Ghomi ◽  
Mohammad Ali Ghasemzadeh ◽  
Safura Zahedi
Keyword(s):  
Zno Nanoparticles ◽  
Environmentally Friendly ◽  
Recyclable Catalyst ◽  
Solvent Free ◽  
One Pot ◽  
One Pot Synthesis ◽  
Solvent Free Conditions ◽  
Xanthene Derivatives ◽  
Highly Effective ◽  
The One

ZnO nanoparticles as a worthwhile and recyclable catalyst have been used for the one-pot synthesis of 1,8-dioxo-decahydroacridines and 1,8-dioxooctahydro-xanthenes via multi-component reactions under solvent-free conditions. The presented method is mild, environmentally friendly, inexpensive and highly effective to give the products in good to excellent yields.

scholarly journals Nanorod vanadatesulfuric acid (VSA NRs)-catalyzed green synthesis of hexahydroacridine-1,8-diones in solvent-free conditions

2015 ◽  
Vol 18 (5) ◽  
pp. 547-553 ◽  
Author(s):  
Masoud Nasr-Esfahani ◽  
Morteza Montazerozohori ◽  
Tooba Abdizadeh
Keyword(s):  
Green Synthesis ◽  
Solvent Free ◽  
Solvent Free Conditions
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